Consider the following two stocks: Stock True" Expected Return Beta ABC 10.0% 1.1 DEF 12.5% 1.8 The risk-free rate is 2% and the expected market return is 7%. a) According to the CAPM, which stock is the better buy and why? [2 marks] b) Suppose returns follow a single-factor structure, and the factor is the market return. Given the above information, is there an arbitrage opportunity? If so, explain what the arbitrage strategy is, giving specific dollar amounts or relative proportions (not just long X, short Y). If not, explain why not. [3 marks]